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mutiply 1. xsquare+4ysquare+zsquare+2xy+xz-2yz by x-2y-z |
| (x2+4y2+z2+2xy+xz-2yz)*(x-2y-z)=x2*(x-2y-z)+4y2*(x-2y-z)+z2*(x-2y-z)+2xy*(x-2y-z)+xz*(x-2y-z)-2yz*(x-2y-z) =(x3-2x2y-x2z)+(4y2x-8y3-4y2z)+(xz2-2yz2-z3)+(2x2y-4xy2-2xyz)+(x2z-2xyz-xz2)-(2xyz-4y2z-2yz2) =x3-2x2y-x2z+4xy2-8y3-4y2z+xz2-2yz2-z3+2x2y-4xy2-2xyz+x2z-2xyz-xz2-2xyz+4y2z+2yz2 =x3-8y3-z3-6xyz |
